. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HrO, BINDING IN GNATHOPHAL'SIA 287 OXYGEN PARTIAL PRESSURE (torr) 0 50 100 150 200. NIGHT DAY 1000 10 20 TEMPERATURE (°C) Figure 1. The day and night depth distribution patterns ofGnalhu- phuusia ingens shown with environmental temperatures and O: partial pressures off southern California. of the oxygen minimum layer oft" southern California (Fig. 1,6-20 torr O2, 4-7°C) (Childress and Price, 1978, 1983). This species has limited anaerobic capacity, and is able to live aerobically at the lowest P0, it encounters off sout
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HrO, BINDING IN GNATHOPHAL'SIA 287 OXYGEN PARTIAL PRESSURE (torr) 0 50 100 150 200. NIGHT DAY 1000 10 20 TEMPERATURE (°C) Figure 1. The day and night depth distribution patterns ofGnalhu- phuusia ingens shown with environmental temperatures and O: partial pressures off southern California. of the oxygen minimum layer oft" southern California (Fig. 1,6-20 torr O2, 4-7°C) (Childress and Price, 1978, 1983). This species has limited anaerobic capacity, and is able to live aerobically at the lowest P0, it encounters off southern California (Childress, 1968; 1971), although it may use anaerobic metabolism briefly to support high activity levels at the lowest O: levels. Its ability to regulate its oxygen consumption to P0, values as low as 3 torr is due to its ability to maintain a high ventilatory flow (up to 8 body volumes min~'), and simultaneously to re- move a large fraction (50-80%) of the oxygen in the in- haled water (Childress, 1971). These abilities are made possible by the highly developed gills and circulatory sys- tem (Belman and Childress, 1976). Belman and Chil- dress (1976) also showed that a high affinity, high cooper- ativity respiratory protein must be present to provide sufficient hemolymph oxygen carrying capacity and un- loading at the very low P0, values at which these mysids live, although at the time of their studies no respiratory protein had been found in the order Mysidacea. A preliminary report demonstrated the presence, in Gnathophausia ingens, of a hemocyanin having a high affinity for oxygen at 20°C (Freel. 1978), but the proper- ties of this hemocyanin were not measured at environ- mentally appropriate temperatures or pH levels. The re- port by Freel is the only publication on a hemocyanin in the entire order Mysidacea. The high affinity at high temperature reported by Freel appears anomalous; the O; affinity of hemocyanin normally increases greatly at low t
Size: 1717px × 1455px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
